I always thought the Mark Data Prodcuts graphic/text parser adventure games were really fun....Calixto Island, Trekboer, Black Sanctum, Shenanigans, Sea Quest, and The Vortex Factor. I only ever had the cassette versions (copied over to disk)...the in game saves always needed a cassette recorder to save game progress. Were there ever any patches or official releases to do game progress saves on diskette for these Mark Data adventure games?